Experimental and Analytical Study on Local Buckling Behavior of High Strength Steel Welded I-Section Beams
Experimental and Analytical Study on Local Buckling Behavior of High Strength Steel Welded I-Section Beams
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DOI：
10.1007/s13296-018-0196-6
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发表时间：
2019-01
影响因子：
1.5
通讯作者：
Yongjiu Shi;Kelong Xu
中科院分区：
文献类型：
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作者：
Yongjiu Shi;Kelong Xu
随着冶金技术和钢铁生产工艺的进步，结构钢的强度可以得到提高，其他材料性能也可以得到提高，包括更高的韧性和更好的可焊性。同时，高强度钢（HSS）在民用结构中也有许多潜在的应用，如大跨度空间框架、高层建筑中的传递桁架以及桁架桥梁。要使高速钢在工程结构中得到广泛应用，必须对由高速钢构成的构件的力学性能进行深入的研究和量化。本文对6根Q550 HSS工字梁在弯矩梯度作用下和4根Q550 HSS工字梁在补片荷载作用下进行了试验，研究了工字梁在不同荷载作用下的局部屈曲行为。得到了试件的破坏模式、局部临界屈曲强度、极限强度、荷载-变形曲线、荷载-应变曲线和弯矩-旋转曲线。根据现行规范ANSI/AISC 360-16、欧洲规范3、AS 4100-1998、AIJ LSD 2010和GB 50017-2003中可用的设计方法，进一步将极限强度试验结果与设计结果进行了比较。考虑材料非线性、几何缺陷和残余应力，建立了有限元模型，并与已有试验结果进行了验证，对两组240梁进行了参数化分析。参数化研究的重点是材料性能和构件板长细对MG和PL作用下工字截面梁极限强度的影响，并将参数化分析结果、试验结果与ANSI/AISC 360-16和欧洲规范3的设计结果进行了比较。
With the progress in metallurgical technique and steel production process, the strength of structural steels can be improved, along with other material properties, including higher toughness and better weldability. Meanwhile, there are numerous potential civil structural applications for high strength steel (HSS), such as large-span space frames, transfer truss in high-rise buildings, as well as truss bridges. The mechanical behavior of structural members made up from HSS must be closely investigated and quantified before HSS can be widely used in engineering structures. In this paper experiments on six Q550 HSS I-section beams under moment gradient (MG) and four Q550 HSS I-section beams under patch loading (PL) were carried out, to investigate the local buckling behavior of I-section beams subjected to different loading conditions. The failure modes, critical local buckling strengths, ultimate strengths, load–deformation curves, load–strain curves and moment–rotation curves of the specimens were obtained. The test results of ultimate strengths were further compared with the design results in accordance with the available design methods in current specifications, ANSI/AISC 360-16, Eurocode 3, AS 4100-1998, AIJ LSD 2010 and GB 50017-2003. Accounting for material nonlinearity, geometric imperfection and residual stress, finite element models were established and verified with the existing test results, which were used for the parametric analysis of two series of 240 beams. The parametric investigation focused on the effects of the material properties and component plate slenderness on the ultimate strengths of I-section beams under MG and the ones under PL. The comparisons between the parametric analysis results, test results and the design results from ANSI/AISC 360-16 and Eurocode 3 were also conducted.